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+---
+icon: material/castle
+---
+
+# Adapting StableDiffusionXL
+
+Stable Diffusion XL (SDXL) is a very popular text-to-image open source foundational model. This guide will show you how to boost its capabilities without the need for tedious prompt engineering with Refiners using iconic adapters the framework supports out-of-the-box. We'll follow a step by step approach, progressively increasing the number of adapters involved to showcase how simple adapter composition is using Refiners. Our use case will be the generation of an image with "a futuristic castle surrounded by a forest, mountains in the background".
+
+## Prerequisites
+
+!!! warning
+ You need to have access to a GPU to run this guide's code snippets (the examples use CUDA), with minimum 24GB VRAM.
+
+First, make sure Refiners is installed in your local environment - see [Getting started](https://refine.rs/getting_started/#installation).
+
+Before diving into adapters, let's see establish a baseline by simply prompting SDXL with Refiners.
+
+!!! note "Reminder"
+ A StableDiffusion model is composed of three modules:
+
+ - An Autoencoder, responsible for embedding images into a latent space;
+ - A UNet, responsible for the diffusion process;
+ - A prompt encoder, such as CLIP, responsible for encoding the user prompt which will guide the diffusion process.
+
+First, download and convert the weights of each module by calling our conversion scripts directly from your terminal (make sure you're in your local `refiners` directory, with your local environment active):
+
+```bash
+python scripts/conversion/convert_transformers_clip_text_model.py --from "stabilityai/stable-diffusion-xl-base-1.0" --subfolder2 text_encoder_2 --to DoubleCLIPTextEncoder.safetensors --half
+python scripts/conversion/convert_diffusers_unet.py --from "stabilityai/stable-diffusion-xl-base-1.0" --to sdxl-unet.safetensors --half
+python scripts/conversion/convert_diffusers_autoencoder_kl.py --from "madebyollin/sdxl-vae-fp16-fix" --subfolder "" --to sdxl-lda.safetensors --half
+```
+
+!!! note
+ This will download the original weights from https://huggingface.co/ which takes some time. If you already have this repo cloned locally, use the `--from /path/to/stabilityai/stable-diffusion-xl-base-1.0` option instead.
+
+Now, we can write the Python script responsible for inference. Just create a simple `inference.py` file, and open it in your favorite editor.
+
+Start by instantiating a [`StableDiffusion_XL`][refiners.foundationals.latent_diffusion.stable_diffusion_xl.StableDiffusion_XL] model and load it with the converted weights:
+
+```py
+import torch
+
+from refiners.fluxion.utils import manual_seed, no_grad
+from refiners.foundationals.latent_diffusion.stable_diffusion_xl import StableDiffusion_XL
+
+# Load SDXL
+sdxl = StableDiffusion_XL(device="cuda", dtype=torch.float16) # Using half-precision for memory efficiency
+sdxl.clip_text_encoder.load_from_safetensors("DoubleCLIPTextEncoder.safetensors")
+sdxl.unet.load_from_safetensors("sdxl-unet.safetensors")
+sdxl.lda.load_from_safetensors("sdxl-lda.safetensors")
+
+```
+
+Then, define the inference parameters by setting the appropriate prompt / seed / inference steps:
+
+```py
+# Hyperparameters
+prompt = "a futuristic castle surrounded by a forest, mountains in the background"
+seed = 42
+sdxl.set_inference_steps(50, first_step=0)
+sdxl.set_self_attention_guidance(
+ enable=True, scale=0.75
+) # Enable self-attention guidance to enhance the quality of the generated images
+
+# ... Inference process
+
+```
+
+You can now define and run the proper inference process:
+
+```py
+with no_grad(): # Disable gradient calculation for memory-efficient inference
+ clip_text_embedding, pooled_text_embedding = sdxl.compute_clip_text_embedding(
+ text=prompt + ", best quality, high quality",
+ negative_text="monochrome, lowres, bad anatomy, worst quality, low quality",
+ )
+ time_ids = sdxl.default_time_ids
+
+ manual_seed(seed=seed)
+
+ # Using a higher latents inner dim to improve resolution of generated images
+ x = torch.randn(size=(1, 4, 256, 256), device=sdxl.device, dtype=sdxl.dtype)
+
+ # Diffusion process
+ for step in sdxl.steps:
+ if step % 10 == 0:
+ print(f"Step {step}")
+ x = sdxl(
+ x,
+ step=step,
+ clip_text_embedding=clip_text_embedding,
+ pooled_text_embedding=pooled_text_embedding,
+ time_ids=time_ids,
+ )
+ predicted_image = sdxl.lda.decode_latents(x)
+
+predicted_image.save("vanilla_sdxl.png")
+
+```
+
+
+??? example "Expand to see the entire end-to-end code"
+
+ ```py
+ import torch
+
+ from refiners.fluxion.utils import manual_seed, no_grad
+ from refiners.foundationals.latent_diffusion.stable_diffusion_xl import StableDiffusion_XL
+
+ # Load SDXL
+ sdxl = StableDiffusion_XL(device="cuda", dtype=torch.float16)
+ sdxl.clip_text_encoder.load_from_safetensors("DoubleCLIPTextEncoder.safetensors")
+ sdxl.unet.load_from_safetensors("sdxl-unet.safetensors")
+ sdxl.lda.load_from_safetensors("sdxl-lda.safetensors")
+
+ # Hyperparameters
+ prompt = "a futuristic castle surrounded by a forest, mountains in the background"
+ seed = 42
+ sdxl.set_inference_steps(50, first_step=0)
+ sdxl.set_self_attention_guidance(
+ enable=True, scale=0.75
+ ) # Enable self-attention guidance to enhance the quality of the generated images
+
+
+ with no_grad(): # Disable gradient calculation for memory-efficient inference
+ clip_text_embedding, pooled_text_embedding = sdxl.compute_clip_text_embedding(
+ text=prompt + ", best quality, high quality",
+ negative_text="monochrome, lowres, bad anatomy, worst quality, low quality",
+ )
+ time_ids = sdxl.default_time_ids
+
+ manual_seed(seed=seed)
+
+ # Using a higher latents inner dim to improve resolution of generated images
+ x = torch.randn(size=(1, 4, 256, 256), device=sdxl.device, dtype=sdxl.dtype)
+
+ # Diffusion process
+ for step in sdxl.steps:
+ if step % 10 == 0:
+ print(f"Step {step}")
+ x = sdxl(
+ x,
+ step=step,
+ clip_text_embedding=clip_text_embedding,
+ pooled_text_embedding=pooled_text_embedding,
+ time_ids=time_ids,
+ )
+ predicted_image = sdxl.lda.decode_latents(x)
+
+ predicted_image.save("vanilla_sdxl.png")
+
+ ```
+
+
+It's time to execute your code. The resulting image should look like this:
+
+
+
+
+
+It is not really what we prompted the model for. To improve the results using only this vanilla model, and get a more futuristic-looking castle, one would need lots of tedious prompt engineering, without any certainty of real improvements.
+
+A simpler solution to this problem would be to use a pretrained LoRA, tailored for our use case. Well, it turns out that there is a LoRA for it on Civitai, called [Sci-fi Environments](https://civitai.com/models/105945?modelVersionId=140624)!
+
+## Single LoRA
+
+To use the [Sci-fi Environments](https://civitai.com/models/105945?modelVersionId=140624) LoRA, all you have to do is download its weights to disk as a `.safetensors`, and inject them into SDXL using [`SDLoraManager`][refiners.foundationals.latent_diffusion.lora.SDLoraManager] right after instantiating `StableDiffusion_XL`:
+
+```py
+from refiners.fluxion.utils import load_from_safetensors
+from refiners.foundationals.latent_diffusion.lora import SDLoraManager
+
+# Load LoRA weights from disk and inject them into target
+manager = SDLoraManager(sdxl)
+scifi_lora_weights = load_from_safetensors("Sci-fi_Environments_sdxl.safetensors")
+manager.add_loras("scifi-lora", tensors=scifi_lora_weights)
+
+```
+
+??? example "Expand to see the entire end-to-end code"
+
+ ```py
+ import torch
+
+ from refiners.fluxion.utils import load_from_safetensors, manual_seed, no_grad
+ from refiners.foundationals.latent_diffusion.lora import SDLoraManager
+ from refiners.foundationals.latent_diffusion.stable_diffusion_xl import StableDiffusion_XL
+
+ # Load SDXL
+ sdxl = StableDiffusion_XL(device="cuda", dtype=torch.float16)
+ sdxl.clip_text_encoder.load_from_safetensors("DoubleCLIPTextEncoder.safetensors")
+ sdxl.unet.load_from_safetensors("sdxl-unet.safetensors")
+ sdxl.lda.load_from_safetensors("sdxl-lda.safetensors")
+
+ # Load LoRA weights from disk and inject them into target
+ manager = SDLoraManager(sdxl)
+ scifi_lora_weights = load_from_safetensors("Sci-fi_Environments_sdxl.safetensors")
+ manager.add_loras("scifi-lora", tensors=scifi_lora_weights)
+
+ # Hyperparameters
+ prompt = "a futuristic castle surrounded by a forest, mountains in the background"
+ seed = 42
+ sdxl.set_inference_steps(50, first_step=0)
+ sdxl.set_self_attention_guidance(
+ enable=True, scale=0.75
+ ) # Enable self-attention guidance to enhance the quality of the generated images
+
+ with no_grad():
+ clip_text_embedding, pooled_text_embedding = sdxl.compute_clip_text_embedding(
+ text=prompt + ", best quality, high quality",
+ negative_text="monochrome, lowres, bad anatomy, worst quality, low quality",
+ )
+ time_ids = sdxl.default_time_ids
+
+ manual_seed(seed=seed)
+
+ # Using a higher latents inner dim to improve resolution of generated images
+ x = torch.randn(size=(1, 4, 256, 256), device=sdxl.device, dtype=sdxl.dtype)
+
+ # Diffusion process
+ for step in sdxl.steps:
+ if step % 10 == 0:
+ print(f"Step {step}")
+ x = sdxl(
+ x,
+ step=step,
+ clip_text_embedding=clip_text_embedding,
+ pooled_text_embedding=pooled_text_embedding,
+ time_ids=time_ids,
+ )
+ predicted_image = sdxl.lda.decode_latents(x)
+
+ predicted_image.save("scifi_sdxl.png")
+
+ ```
+
+You should get something like this - pretty neat, isn't it?
+
+
+
+
+
+## Multiple LoRAs
+
+Continuing with our futuristic castle example, we might want to turn it, for instance, into a pixel art.
+
+Again, we could either try some tedious prompt engineering,
+or instead use another LoRA found on the web, such as [Pixel Art LoRA](https://civitai.com/models/120096/pixel-art-xl?modelVersionId=135931), found on Civitai.
+This is dead simple as [`SDLoraManager`][refiners.foundationals.latent_diffusion.lora.SDLoraManager] allows loading multiple LoRAs:
+
+```py
+# Load LoRAs weights from disk and inject them into target
+manager = SDLoraManager(sdxl)
+scifi_lora_weights = load_from_safetensors("Sci-fi_Environments_sdxl.safetensors")
+pixel_art_lora_weights = load_from_safetensors("pixel-art-xl-v1.1.safetensors")
+manager.add_multiple_loras(
+ {"scifi-lora": scifi_lora_weights, "pixel-art-lora": pixel_art_lora_weights}
+)
+```
+
+Adapters such as LoRAs also have a [scale](https://github.com/finegrain-ai/refiners/blob/fd01ba910efb764b4521254cded2530b6c31cbd4/src/refiners/fluxion/adapters/lora.py#L17) (roughly) quantifying the effect of this Adapter.
+Refiners allows setting different scales for each Adapter, allowing the user to balance the effect of each Adapter:
+
+```py
+# Load LoRAs weights from disk and inject them into target
+manager = SDLoraManager(sdxl)
+scifi_lora_weights = load_from_safetensors("Sci-fi_Environments_sdxl.safetensors")
+pixel_art_lora_weights = load_from_safetensors("pixel-art-xl-v1.1.safetensors")
+manager.add_multiple_loras(
+ tensors={"scifi-lora": scifi_lora_weights, "pixel-art-lora": pixel_art_lora_weights},
+ scale={"scifi-lora": 1.0, "pixel-art-lora": 1.4},
+)
+```
+
+??? example "Expand to see the entire end-to-end code"
+
+ ```py
+ import torch
+
+ from refiners.fluxion.utils import load_from_safetensors, manual_seed, no_grad
+ from refiners.foundationals.latent_diffusion.lora import SDLoraManager
+ from refiners.foundationals.latent_diffusion.stable_diffusion_xl import StableDiffusion_XL
+
+ # Load SDXL
+ sdxl = StableDiffusion_XL(device="cuda", dtype=torch.float16)
+ sdxl.clip_text_encoder.load_from_safetensors("DoubleCLIPTextEncoder.safetensors")
+ sdxl.unet.load_from_safetensors("sdxl-unet.safetensors")
+ sdxl.lda.load_from_safetensors("sdxl-lda.safetensors")
+
+ # Load LoRAs weights from disk and inject them into target
+ manager = SDLoraManager(sdxl)
+ scifi_lora_weights = load_from_safetensors("Sci-fi_Environments_sdxl.safetensors")
+ pixel_art_lora_weights = load_from_safetensors("pixel-art-xl-v1.1.safetensors")
+ manager.add_multiple_loras(
+ tensors={"scifi-lora": scifi_lora_weights, "pixel-art-lora": pixel_art_lora_weights},
+ scale={"scifi-lora": 1.0, "pixel-art-lora": 1.4},
+ )
+
+ # Hyperparameters
+ prompt = "a futuristic castle surrounded by a forest, mountains in the background"
+ seed = 42
+ sdxl.set_inference_steps(50, first_step=0)
+ sdxl.set_self_attention_guidance(
+ enable=True, scale=0.75
+ ) # Enable self-attention guidance to enhance the quality of the generated images
+
+ with no_grad():
+ clip_text_embedding, pooled_text_embedding = sdxl.compute_clip_text_embedding(
+ text=prompt + ", best quality, high quality",
+ negative_text="monochrome, lowres, bad anatomy, worst quality, low quality",
+ )
+ time_ids = sdxl.default_time_ids
+
+ manual_seed(seed=seed)
+
+ # Using a higher latents inner dim to improve resolution of generated images
+ x = torch.randn(size=(1, 4, 256, 256), device=sdxl.device, dtype=sdxl.dtype)
+
+ # Diffusion process
+ for step in sdxl.steps:
+ if step % 10 == 0:
+ print(f"Step {step}")
+ x = sdxl(
+ x,
+ step=step,
+ clip_text_embedding=clip_text_embedding,
+ pooled_text_embedding=pooled_text_embedding,
+ time_ids=time_ids,
+ )
+ predicted_image = sdxl.lda.decode_latents(x)
+
+ predicted_image.save("scifi_pixel_sdxl.png")
+
+ ```
+
+The results are looking great:
+
+
+
+
+
+## Multiple LoRAs + IP-Adapter
+
+Refiners really shines when it comes to composing different Adapters to fully exploit the possibilities of foundation models.
+
+For instance, IP-Adapter (covered in [a previous blog post](https://blog.finegrain.ai/posts/supercharge-stable-diffusion-ip-adapter/)) is a common choice for practictioners wanting to guide the diffusion process towards a specific prompt image.
+
+In our example, consider this image of the [Neuschwanstein Castle](https://en.wikipedia.org/wiki/Neuschwanstein_Castle):
+
+
+
+ Credits: Bayerische Schlösserverwaltung, Anton Brandl
+
+
+We would like to guide the diffusion process to align with this image, using IP-Adapter. First, download the image as well as the weights of IP-Adapter by calling the following commands from your terminal (again, make sure in you're in your local `refiners` directory):
+
+```bash
+curl -O https://refine.rs/guides/adapting_sdxl/german-castle.jpg
+python scripts/conversion/convert_transformers_clip_image_model.py --from "stabilityai/stable-diffusion-2-1-unclip" --to CLIPImageEncoderH.safetensors --half
+curl -LO https://huggingface.co/h94/IP-Adapter/resolve/main/sdxl_models/ip-adapter-plus_sdxl_vit-h.bin
+python scripts/conversion/convert_diffusers_ip_adapter.py --from ip-adapter-plus_sdxl_vit-h.bin --half
+```
+
+This will download and convert both IP-Adapter and CLIP Image Encoder pretrained weights.
+
+Then, in your Python code, simply instantiate a [`SDXLIPAdapter`][refiners.foundationals.latent_diffusion.stable_diffusion_xl.image_prompt.SDXLIPAdapter] targetting our `sdxl.unet`, and inject it using a simple `.inject()` call:
+
+```py
+# IP-Adapter
+ip_adapter = SDXLIPAdapter(
+ target=sdxl.unet,
+ weights=load_from_safetensors("ip-adapter-plus_sdxl_vit-h.safetensors"),
+ scale=1.0,
+ fine_grained=True # Use fine-grained IP-Adapter (i.e IP-Adapter Plus)
+)
+ip_adapter.clip_image_encoder.load_from_safetensors("CLIPImageEncoderH.safetensors")
+ip_adapter.inject()
+
+```
+
+Then, at runtime, we simply compute the embedding of the image prompt through the `ip_adapter` object, and set its embedding calling `.set_clip_image_embedding()`:
+
+```py
+from PIL import Image
+image_prompt = Image.open("german-castle.jpg")
+
+with torch.no_grad():
+ clip_image_embedding = ip_adapter.compute_clip_image_embedding(ip_adapter.preprocess_image(image_prompt))
+ ip_adapter.set_clip_image_embedding(clip_image_embedding)
+
+# And start the diffusion process
+```
+
+!!! note
+ Be wary that composing Adapters (especially ones of different natures, such as LoRAs and IP-Adapter) can be tricky, as their respective effects can be adversarial. This is visible in our example below. In the code below, we tuned the LoRAs scales respectively to `1.5` and `1.55`. We invite you to try and test different seeds and scales to find the perfect combination!
+
+??? example "Expand to see the entire end-to-end code"
+
+ ```py
+ import torch
+ from PIL import Image
+
+ from refiners.fluxion.utils import load_from_safetensors, manual_seed, no_grad
+ from refiners.foundationals.latent_diffusion.lora import SDLoraManager
+ from refiners.foundationals.latent_diffusion.stable_diffusion_xl import StableDiffusion_XL
+ from refiners.foundationals.latent_diffusion.stable_diffusion_xl.image_prompt import SDXLIPAdapter
+
+ # Load SDXL
+ sdxl = StableDiffusion_XL(device="cuda", dtype=torch.float16)
+ sdxl.clip_text_encoder.load_from_safetensors("DoubleCLIPTextEncoder.safetensors")
+ sdxl.unet.load_from_safetensors("sdxl-unet.safetensors")
+ sdxl.lda.load_from_safetensors("sdxl-lda.safetensors")
+
+ # Load LoRAs weights from disk and inject them into target
+ manager = SDLoraManager(sdxl)
+ scifi_lora_weights = load_from_safetensors("Sci-fi_Environments_sdxl.safetensors")
+ pixel_art_lora_weights = load_from_safetensors("pixel-art-xl-v1.1.safetensors")
+ manager.add_multiple_loras(
+ tensors={"scifi-lora": scifi_lora_weights, "pixel-art-lora": pixel_art_lora_weights},
+ scale={"scifi-lora": 1.5, "pixel-art-lora": 1.55},
+ )
+
+ # Load IP-Adapter
+ ip_adapter = SDXLIPAdapter(
+ target=sdxl.unet,
+ weights=load_from_safetensors("ip-adapter-plus_sdxl_vit-h.safetensors"),
+ scale=1.0,
+ fine_grained=True, # Use fine-grained IP-Adapter (IP-Adapter Plus)
+ )
+ ip_adapter.clip_image_encoder.load_from_safetensors("CLIPImageEncoderH.safetensors")
+ ip_adapter.inject()
+
+ # Hyperparameters
+ prompt = "a futuristic castle surrounded by a forest, mountains in the background"
+ image_prompt = Image.open("german-castle.jpg")
+ seed = 42
+ sdxl.set_inference_steps(50, first_step=0)
+ sdxl.set_self_attention_guidance(
+ enable=True, scale=0.75
+ ) # Enable self-attention guidance to enhance the quality of the generated images
+
+ with no_grad():
+ clip_text_embedding, pooled_text_embedding = sdxl.compute_clip_text_embedding(
+ text=prompt + ", best quality, high quality",
+ negative_text="monochrome, lowres, bad anatomy, worst quality, low quality",
+ )
+ time_ids = sdxl.default_time_ids
+
+ clip_image_embedding = ip_adapter.compute_clip_image_embedding(ip_adapter.preprocess_image(image_prompt))
+ ip_adapter.set_clip_image_embedding(clip_image_embedding)
+
+ manual_seed(seed=seed)
+ x = torch.randn(size=(1, 4, 128, 128), device=sdxl.device, dtype=sdxl.dtype)
+
+ # Diffusion process
+ for step in sdxl.steps:
+ if step % 10 == 0:
+ print(f"Step {step}")
+ x = sdxl(
+ x,
+ step=step,
+ clip_text_embedding=clip_text_embedding,
+ pooled_text_embedding=pooled_text_embedding,
+ time_ids=time_ids,
+ )
+ predicted_image = sdxl.lda.decode_latents(x)
+
+ predicted_image.save("scifi_pixel_IP_sdxl.png")
+
+ ```
+
+The result looks convincing: we do get a *pixel-art, futuristic-looking Neuschwanstein castle*!
+
+
+
+
+
+
+## Wrap up
+
+As you can see in this guide, composing Adapters on top of foundation models is pretty seamless in Refiners, allowing practitioners to quickly test out different combinations of Adapters for their needs. We encourage you to try out different ones, and even train some yourselves!
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index 9eac693..9f8d105 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -60,6 +60,7 @@ nav:
- getting-started/advanced.md
- Guides:
- guides/index.md
+ - guides/adapting_sdxl.md
- Key Concepts:
- concepts/chain.md
- concepts/context.md
+
+
+
+ 
+